Updated catches of sandbar, dusky, and blacknose...

Updated catches of Atlantic sharpnose and bonnethead sharks

Enric Cortés and Ivy Baremore

SEDAR34-WP-20

Submitted: 10 June 2013

This information is distributed solely for the purpose of pre-dissemination peer review. It does not represent and should not be construed to represent any agency determination or policy.

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Please cite this document as: Cortés, E. and I. Baremore. 2013. Updated catches of Atlantic sharpnose and bonnethead sharks. SEDAR34-WP-20. SEDAR, North Charleston, SC. 42 pp.

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Submitted June 10, 2013 SEDAR 34-WP-20

Updated catches of Atlantic sharpnose and bonnethead sharks

Enric Cortés1 and Ivy Baremore1

NOAA Fisheries Southeast Fisheries Science Center

Panama City Laboratory 3500 Delwood Beach Drive,

Panama City, FL 32408, USA

ABSTRACT

This document presents updated commercial landings, recreational catches, and discard estimates of Atlantic sharpnose and bonnethead sharks up to 2011. Information on the geographical distribution of both commercial landings and recreational catches is presented along with gear-specific information of commercial landings. Length-frequency information and trends in average size of the catches from several commercial and recreational sources are also presented.

KEYWORDS

Catch, Landings, Discards, Commercial fishing, Long lining, Shark fisheries, Bycatch, Observer programs, Atlantic sharpnose shark, Bonnethead shark

1 National Oceanographic and Atmospheric Administration, National Marine Fisheries Service, Southeast Fisheries Science Center, Panama City Laboratory, 3500 Delwood Beach Road, Panama City, Florida 32408, U.S.A. E-mail: [email protected]; [email protected]

mailto:[email protected]

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1. Background The Catch Statistics Working Group (WG) of SEDAR 13 provided summary reports and tables of Atlantic sharpnose and bonnethead shark catches. The purpose of the present document is to build upon that information to update the baseline scenario catch tables for these two species to facilitate input into the SEDAR 34 stock assessments. Information on geographical distribution of commercial landings and recreational catches as well as gear-specific information of commercial landings from several sources is updated. Size (length compositions and trends in average length and weight) information from several commercial and recreational sources is also updated. 2. Catch histories 2.1. Commercial landings U.S. commercial landings in weight for both species in 1995-2011 were compiled based on Northeast regional general canvass landings data, Southeast Accumulated Landings System (ALS) data, and SEFSC Pelagic Dealer Compliance (PDC) data based on southeastern region permitted shark dealer reports. The larger of the two values reported in the southeast ALS and PDC was taken as the value of shark landings for the southeast. The landings from the northeast general canvass data were then added to the southeast landings to produce total U.S. estimates. As in SEDAR 13, commercial landings were split into three groups according to the predominant gear types: longlines, nets (including drift gillnets and all gillnet types), and lines (including troll lines, hook and line, and bandit gear). These three gear types accounted for the vast majority of the volume of reported commercial landings (typically 97-100% in any given year for 1997-2011). Commercial landings for each of these three main gear categories (longlines, nets, and lines) for 1995-2011 were computed by multiplying total landings by the proportion that each of these three gear types make up of all gears (in the northeast canvass and ALS data). Commercial landings in numbers were then calculated by dividing landings in weight for each of the three gears by the average weight from the Bottom Longline Observer Program (BLLOP; longlines and lines) or the Gillnet Observer Program (GNOP; nets). All weights from the BLLOP and GNOP were predicted from fork length measurements taken by observers in the directed shark bottom longline fishery and gillnet fishery, respectively, using the corresponding length-weight regression. Average weights were available for 1995-2011 from the BLLOP, and for 2002-2011 from the GNOP. Landings prior to 1995 were taken from SEDAR 13, where they were re-constructed assuming: an exponential increase from 1980 to 1995 (longlines); a linear increase from 1980 to 1995 (nets); and a linear increase from 1950 to 1995 (lines). See “Catch histories” in SEDAR 13 SCS DW Report for more details.

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2.2 Recreational catches Recreational catches of blacktip sharks correspond to estimates from three data collection programs: the Marine Recreational Information Program (MRIP), the NMFS Headboat Survey (HBOAT) operated by the SEFSC Beaufort Laboratory, and the Texas Parks and Wildlife Department Recreational Fishing Survey (TXPWD). The MRIP has effectively replaced MRFSS (Marine Recreational Fishery Statistics Survey), but new estimates for a suite of fish species, including sharks, are only available for the period 2004-2011. For 1980-2003, we used MRFSS estimates; however, MRFSS estimates will be adjusted to MRIP using ratio estimators (see SEDAR 34-WP-xx by V. Matter). Total, annual recreational catch estimates of blacktip sharks in the Gulf of Mexico were computed as the sum of the MRIP (or MRFSS) (A+B1=fished landed or killed), HBOAT (fish landed), and TXPWD (fish landed) survey estimates. Catches prior to 1981 were taken from SEDAR 13, where they were back-calculated based on trends in population growth in coastal states form the US Census Bureau). See “Catch histories” in SEDAR 13 SCS DW Report for more details. We also accounted for live post-release mortality (the proportion of sharks released alive that die) by multiplying B2s in MRFSS (1981-2003) and MRIP (2004-2011) by an estimated hook-and-line post-release mortality rate of 10% for both Atlantic sharpnose and bonnethead (see SEDAR 34-WP-08 by D. Courtney). 2.3 Bottom longline dead discards and live post-release mortality Dead discard estimates in bottom longlines for 1995-2005 were calculated by multiplying the average dead discard rate observed for 1994-2005 (77.6% for Atlantic sharpnose; 58.7% for bonnethead) by the annual catch (in numbers) in longlines (from section 2.1). To compute dead discard estimates for 2006-2011, we used the average dead discard rate observed for the period 2006-2011 (51.8% for Atlantic sharpnose; 52.3% for bonnethead). We used average discard rates for these two periods because single, annual estimates show large interannual variation. These data will be replaced by dead discard estimates obtained from the Coastal Fishery Logbook program and the BLLOP for 2005-2011 (see SEDAR 34-WP-21 by J. Carlson). Dead discards prior to 1995 were taken from SEDAR 13, where they were re-constructed by multiplying the average discard rate for 1994-2005 by the back-calculated annual longline landings for 1981-1994. See “Catch histories” in SEDAR 13 SCS DW Report for more details. We also accounted for live post-release mortality (the proportion of sharks released alive that die) by multiplying landings from longlines, nets, and lines by the percentage released alive in each of these gears (from observer programs) and the post-release mortality rate estimated for each of these gears. For Atlantic sharpnose, percent released alive was 0.24 (mean of 2005-2011 from the BLLOP) for longline, 0.098 (mean of 1998-2011 from the GNOP) for

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nets, and 0.24 (the same value as for longlines) for lines. For bonnethead, percent released alive was 0.024 (mean of 2005-2011 from the BLLOP) for longline, 0.053 (mean of 1998-2011 from the GNOP) for nets, and 0.024 (the same value as for longlines) for lines. The estimated post-release mortality rate for Atlantic sharpnose was 35% in longlines and gillnets, and 10% in lines; for bonnethead it was 40% in longlines and gillnets, and 10% in lines (see SEDAR 34-WP-08 by D. Courtney). 2.4 Shrimp trawl fishery discards Dead discard estimates from the shrimp trawl fishery in the Gulf of Mexico for 1972-2005 were taken from SEDAR 13. Values for 2006-2011 were assumed equal to the mean of 2003-2005 values. These estimates will be updated with values provided by Zhang et al. (see SEDAR34-WP-18) using the same methodology as Nichols (2007) using WinBUGS (SEDAR 13-DW-32). Estimates for the Atlantic were not produced (see “Catch histories” in SEDAR 13 SCS DW Report for more details, but the Atlantic estimates were rejected because of extreme interannual variability and very low sample sizes in some years). Thus, as in SEDAR 13, estimates for the GOM were considered more reliable and those for the ATL were obtained by scaling the GOM estimates by the ratio of the observed days in the SA (2.2 days on average) to the observed days in the GOM (17.5 days on average) or 12.6%. For 1981, which had a very large estimate, the geometric mean of the 3 preceding and 3 ensuing years was used instead. For the historic landings (1950-1971), bycatch estimates were obtained by applying the mean ratio of shrimp to sharks caught by year for the period 1972-2005. See “Catch histories” in SEDAR 13 SCS DW Report for more details, but essentially the annual shrimp landings in pounds (heads off) for the period 1950-1971 were divided by this ratio to produce annual estimates. Tables 1 and 2 summarize the updated catch history for Atlantic sharpnose and bonnethead sharks showing each of the sources described above. Figures 1 and 2 show the different catch streams (“fleets”) that can be used for the stock assessment. 2.5 Commercial landings by region and gear Commercial landing information by region and gear was extracted from the ALS (southeast and northeast) data. Averaged over the period 1993-2011, 87% of Atlantic sharpnose sharks and 96% of bonnethead sharks were landed in the South Atlantic (Florida to North Carolina), with very little contribution from the Gulf of Mexico (GOM) region (9% and 4%, respectively) and almost negligible or inexistent for the Mid Atlantic (MA; Virginia to New Jersey) region (3% and 0%, respectively; Tables 3 and 4). For Atlantic sharpnose, drift nets (52%) and gillnets (14%) together accounted for 2/3 of landings in the SA, with longlines averaging 17% and “other gear” (a category that includes the designation “combined gears” from the ALS) 14% during 1993-2011 (Table 5, Fig. 3). For bonnethead, drift nets (76%) and

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gillnets (2%) together accounted for over 3/4 of landings in the SA, with longlines averaging 9% and “other gear” 12% during 1993-2011 (Table 6, Fig. 4). 2.6 Landings by state 2.6.1 Commercial landings by state Commercial landing information by state was extracted from the PDC (covering southeast states only) and the ALS (covering both SE and NE states). For Atlantic sharpnose, data from both the PDC and ALS indicated that in the GOM they were landed mostly in Alabama (Fig. 5), whereas in the SA both sources indicated that Florida’s east coast was the main state of landing (Fig. 6). For bonnethead, data from the PDC indicated that in the GOM they were landed mostly in Florida’s west coast, with more landings recorded in Alabama especially in 2006 and 2011, but the ALS only showed landings in Florida’s west coast (Fig. 7). In the SA both sources indicated that Florida’s east coast was the main state of landing (Fig. 8). 2.6.2 Recreational landings by state Combined data from the MRFSS, HBOAT, and TXPWD surveys indicated that Atlantic sharpnose sharks were caught in very similar proportions in the GOM and SA regions during 1981-2011 (Fig. 9), whereas bonnethead sharks were caught predominantly in the GOM (about 2/3 in the GOM vs. 1/3 in the SA; Fig. 10). Data from MRFSS reveal that South Carolina, both coasts of Florida, and Mississippi accounted for a large proportion of all catches of Atlantic sharpnose sharks (Fig. 9), whereas bonnetheads were predominantly caught in both coasts of Florida (Fig. 10). Data from the HBOAT survey showed Texas and Florida’s east coast as the two most important states where Atlantic sharpnose and bonnethead sharks were caught by headboats (Figs. 9 and 10). 2.7 Average size (length and weight) and length compositions The predicted average weight and observed fork length of Atlantic sharpnose shark from the BLLOP showed a slightly decreasing trend from 1994 to 2011 (Fig. 11) while the decreasing trends for bonnethead shark were a little more accentuated (but sample sizes were very low; Fig. 12). Average weight and fork length from the GNOP also showed a slightly decreasing trend from 2002 to 2011 for Atlantic sharpnose shark (Fig. 13) whereas there was no trend for bonnethead shark (Fig. 14). In contrast, both series for both species from the MRFSS showed a slightly upward trend (Figs. 15 and 16) whereas the HBOAT survey showed a more accentuated decline for Atlantic sharpnose (Fig. 17) and no trend for bonnethead shark (Fig. 18; but sample sizes were very low). The TXPWD survey showed a slightly increasing trend for Atlantic sharpnose (Fig. 19) and a much more accentuated upward trend for bonnethead shark (Fig. 20). Length-frequency distributions of Atlantic sharpnose sharks observed in the BLLOP show that most animals caught were under 90 cm FL, but the majority were mature (ca. ≥ 66 cm

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FL for sexes and areas combined; Fig. 21). Few bonnetheads were observed in the BLLOP, but the vast majority were mature (ca. ≥ 65 cm FL for sexes and areas combined; Fig. 22). Most Atlantic sharpnose and bonnethead sharks observed in the GNOP were mature (Figs. 23 and 24). The recreational fisheries sampled by MRFSS caught all sizes of Atlantic sharpnose and bonnethead sharks, both immature and mature (Figs. 25 and 26), whereas a larger proportion of mature individuals was caught by headboats (Figs. 27 and 28). Similar proportions of immature and mature Atlantic sharpnose sharks were caught in the TXPWD survey (Fig. 29), but proportionally more immature bonnetheads were caught (Fig. 30). Acknowledgments We thank the following people for providing data from several sources: H. Balchowski and G. Gaipo for commercial landings data, V. Matter for recreational catch data, S. Gulak and J. Carlson for bottom longline observer program data, and D. Courtney for post-release mortality rates. References Carlson, J. 2013. Dead discards of Atlantic sharpnose sharks in the shark bottom longline

fishery. SEDAR 34-WP-21. SEDAR, North Charleston, SC. Courtney, D. 2013. A preliminary review of post-release live-discard mortality rate

estimates in sharks for use in SEDAR 34. SEDAR 34-WP-08. SEDAR, North Charleston, SC.

Matter, V. 2013. Ratio estimators for MRIP sharks. SEDAR 34-WP-xx. SEDAR, North Charleston, SC.

Nichols, S. 2007. Bycatch of small coastal sharks in the offshore shrimp fishery. SEDAR 13-DW-32. SEDAR, North Charleston, SC.

SEDAR. 2007. SEDAR 13 – Small coastal shark complex, Atlantic sharpnose, bonnethead, blacknose, and finetooth shark Stock Assessment Report. Available online at: http://www.sefsc.noaa.gov/sedar/

Zhang, X., B. Linton, E. Cortés, and D. Courtney. 2013. Shrimp fishery bycatch estimates for Gulf of Mexico Atlantic sharpnose and bonnethead sharks, 1972-2011. SEDAR 34-WP-18. SEDAR, North Charleston, SC.

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Table 1. Catch history for Atlantic sharpnose sharks (thousands of fish).

BASELINE SCENARIOCATCHES OF ATLANTIC SHARPNOSE SHARKS (in numbers)

Total recreational

removals

Total

Total Longline Nets Lines Longline Nets Lines shrimp b h1950 0 0 0 0 0 0 12,114 12,114 0 175,722 23,435 199,157 211,271

1951 0 0 0 0 0 0 13,314 13,314 0 224,238 31,603 255,841 269,1551952 0 0 1 0 0 1 14,514 14,514 0 229,584 29,353 258,937 273,4511953 0 0 1 0 0 1 15,714 15,714 0 259,963 37,803 297,766 313,4811954 0 0 2 0 0 2 16,914 16,914 0 274,611 32,881 307,492 324,4071955 0 0 2 0 0 2 18,114 18,114 0 245,951 32,746 278,697 296,8131956 0 0 2 0 0 2 19,314 19,314 0 224,199 29,140 253,339 272,6561957 0 0 3 0 0 3 20,514 20,514 0 195,061 32,719 227,780 248,2971958 0 0 3 0 0 3 21,714 21,714 0 200,735 25,481 226,216 247,9331959 0 0 4 0 0 4 22,914 22,914 0 224,067 29,703 253,769 276,6871960 0 0 4 0 0 4 24,114 24,114 0 236,305 35,544 271,849 295,9671961 0 0 4 0 0 4 24,815 24,815 0 113,758 22,669 136,426 161,2461962 0 0 5 0 0 5 25,517 25,517 0 148,927 29,933 178,861 204,3821963 0 0 5 0 0 5 26,218 26,218 0 245,978 23,155 269,133 295,3561964 0 0 6 0 0 6 26,920 26,920 0 215,420 25,337 240,757 267,6821965 0 0 6 0 0 6 27,621 27,621 0 221,774 37,102 258,877 286,5041966 0 0 6 0 0 6 28,322 28,322 0 213,372 30,904 244,276 272,6051967 0 0 7 0 0 7 29,024 29,024 0 270,109 29,785 299,894 328,9241968 0 0 7 0 0 7 29,725 29,725 0 239,327 34,251 273,578 303,3101969 0 0 8 0 0 8 30,427 30,427 0 248,037 38,364 286,401 316,8351970 0 0 8 0 0 8 31,128 31,128 0 285,899 29,517 315,416 346,5521971 0 0 8 0 0 8 34,310 34,310 0 281,092 42,122 323,214 357,5321972 0 0 9 0 0 9 34,613 34,613 0 485,780 61,069 546,849 581,4701973 0 0 9 0 0 9 34,916 34,916 0 102,900 12,936 115,836 150,7611974 0 0 9 0 0 9 35,220 35,220 0 185,074 23,266 208,340 243,5691975 0 0 10 0 0 10 35,523 35,523 0 192,627 24,216 216,843 252,3761976 0 0 10 0 0 10 35,827 35,827 0 141,282 17,761 159,043 194,8801977 0 0 11 0 0 11 36,130 36,130 0 497,629 62,559 560,188 596,3291978 0 0 11 0 0 11 36,434 36,434 0 578,336 72,705 651,041 687,4861979 0 0 11 0 0 11 36,737 36,737 0 470,857 59,194 530,051 566,8001980 50 0 12 89 0 12 41,970 41,970 39 757,373 95,213 852,586 894,6561981 75 0 12 133 0 12 43,490 43,490 58 376,709 47,358 424,066 467,7021982 112 0 13 199 0 1,021 40,656 41,665 87 208,879 26,259 235,138 278,0231983 168 0 13 298 0 120 46,248 46,355 130 343,009 43,121 386,130 432,9041984 250 0 13 444 0 6,408 36,562 42,957 194 193,399 24,313 217,712 267,5211985 373 0 14 663 0 1,317 24,366 25,669 290 293,171 36,856 330,027 357,6751986 556 0 14 988 0 1,090 36,595 37,671 432 202,706 25,483 228,189 267,9371987 830 663 15 1,474 663 554 38,568 39,107 644 568,133 71,422 639,555 681,3531988 1,238 1,326 15 2,199 1,326 5,683 81,032 86,700 961 322,388 40,529 362,917 458,8251989 1,847 1,989 15 3,281 1,989 1,156 59,813 60,953 1,434 270,901 34,056 304,957 372,3371990 2,755 2,652 16 4,894 2,652 541 51,417 51,942 2,139 303,917 38,207 342,124 402,1531991 4,110 3,315 16 7,301 3,315 915 142,387 143,286 3,191 460,335 57,871 518,206 673,0241992 6,132 3,978 17 10,893 3,978 2,693 87,641 90,317 4,761 860,192 108,138 968,330 1,076,2111993 9,148 4,641 17 16,251 4,641 2,074 81,211 83,268 7,103 385,082 48,410 433,492 539,7251994 13,647 5,305 17 24,243 5,305 9,482 106,625 116,089 10,596 230,386 28,963 259,349 414,4671995 28,499 22,514 5,968 18 41,894 5,968 7,328 155,679 162,989 17,480 567,054 71,287 638,341 856,5211996 62,488 59,551 2,923 14 110,811 2,923 6,969 81,276 88,231 46,236 446,999 56,194 503,193 712,1261997 69,777 7,341 61,532 904 13,660 61,563 4,115 73,418 76,629 5,700 292,293 36,745 329,038 485,0041998 63,021 6,402 54,606 2,012 11,913 54,675 7,809 75,870 81,667 4,971 455,072 57,209 512,281 668,3451999 66,648 5,284 57,258 4,106 9,832 57,399 19,523 66,459 81,876 4,102 276,374 34,744 311,118 479,7482000 38,415 3,949 33,312 1,154 7,349 33,352 27,556 127,257 153,659 3,066 478,883 60,202 539,085 761,0002001 53,160 4,780 47,150 1,230 8,894 47,192 46,786 127,913 173,469 3,711 283,371 35,624 318,995 595,3362002 53,485 9,872 42,712 901 18,369 42,743 27,687 85,870 112,656 7,665 567,679 71,365 639,044 840,4992003 52,067 29,551 19,877 2,639 54,988 19,967 35,199 84,995 117,555 22,944 262,108 32,951 295,059 522,7692004 59,336 24,488 34,156 691 45,568 34,180 26,789 74,801 100,899 19,013 153,970 19,356 173,326 380,7622005 93,244 25,738 66,348 1,159 47,892 66,388 35,124 76,363 110,328 19,983 289,384 36,380 325,764 585,4972006 129,065 38,728 88,215 2,122 62,064 88,288 65,179 76,645 139,702 20,069 235,154 36,380 271,534 626,7672007 131,439 12,887 115,423 3,130 20,652 115,530 48,587 98,477 143,935 6,678 235,154 36,380 271,534 600,2372008 66,607 10,425 54,863 1,319 16,707 54,908 31,062 72,412 102,155 5,402 235,154 36,380 271,534 476,3652009 89,536 31,861 56,405 1,270 51,059 56,449 33,386 64,807 96,923 16,510 235,154 36,380 271,534 509,3512010 59,281 16,852 37,507 4,922 27,006 37,676 91,020 70,716 156,814 8,733 235,154 36,380 271,534 584,0492011 83,002 24,849 51,776 6,377 39,822 51,995 19,367 47,324 60,314 12,877 235,154 36,380 271,534 443,033

Total commercial removals TotalShrimp bycatch

(SA)

Year Commercial Recreational catches

Bottom longline discards

Shrimp bycatch (GOM)

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Table 2. Catch history for bonnethead sharks (thousands of fish).

BASELINE SCENARIOCATCHES OF BONNETHEAD SHARKS (in numbers)

Total

Total Longline Nets Lines Longline Nets Lines shrimp bycatch

1950 0 0 0 0 0 0 7,469 7,469 0 90,488 12,518 103,005 110,4741951 0 0 0 0 0 0 13,314 13,314 0 115,471 16,880 132,351 145,6651952 0 0 0 0 0 0 14,514 14,514 0 118,224 15,678 133,902 148,4161953 0 0 0 0 0 0 15,714 15,714 0 133,867 20,192 154,059 169,7731954 0 0 0 0 0 0 16,914 16,914 0 141,410 17,563 158,973 175,8871955 0 0 0 0 0 0 18,114 18,114 0 126,652 17,491 144,143 162,2571956 0 0 0 0 0 0 19,314 19,314 0 115,451 15,565 131,016 150,3301957 0 0 0 0 0 0 20,514 20,514 0 100,446 17,477 117,923 138,4371958 0 0 0 0 0 0 21,714 21,714 0 103,368 13,610 116,978 138,6921959 0 0 0 0 0 0 22,914 22,914 0 115,383 15,865 131,248 154,1621960 0 0 0 0 0 0 15,058 15,058 0 121,685 18,985 140,670 155,7291961 0 0 0 0 0 0 15,760 15,760 0 58,579 12,108 70,687 86,4471962 0 0 0 0 0 0 16,461 16,461 0 76,690 15,988 92,678 109,1391963 0 0 0 0 0 0 17,162 17,162 0 126,666 12,368 139,034 156,1961964 0 0 0 0 0 0 17,864 17,864 0 110,930 13,533 124,463 142,3271965 0 0 0 0 0 0 18,565 18,565 0 114,202 19,818 134,020 152,5851966 0 0 0 0 0 0 19,267 19,267 0 109,876 16,507 126,382 145,6491967 0 0 0 0 0 0 19,968 19,968 0 139,092 15,909 155,001 174,9691968 0 0 0 0 0 0 20,669 20,669 0 123,241 18,295 141,535 162,2051969 0 0 0 0 0 0 21,371 21,371 0 127,726 20,491 148,218 169,5881970 0 0 0 0 0 0 18,450 18,450 0 147,223 15,766 162,989 181,4401971 0 0 0 0 0 0 21,632 21,632 0 144,748 22,499 167,247 188,8791972 0 0 0 0 0 0 21,935 21,935 0 230,616 28,992 259,608 281,5441973 0 0 0 0 0 0 22,239 22,239 0 168,133 21,137 189,270 211,5091974 0 0 0 0 0 0 22,542 22,542 0 227,183 28,560 255,743 278,2851975 0 0 0 0 0 0 22,846 22,846 0 337,902 42,479 380,381 403,2271976 0 0 0 0 0 0 23,149 23,149 0 152,590 19,183 171,773 194,9221977 0 0 0 0 0 0 23,453 23,453 0 295,526 37,152 332,678 356,1301978 0 0 0 0 0 0 23,756 23,756 0 72,078 9,061 81,139 104,8961979 0 0 0 0 0 0 24,060 24,060 0 282,239 35,482 317,721 341,7811980 0 0 0 0 0 0 25,067 25,067 0 141,564 17,797 159,361 184,4281981 0 0 0 0 0 0 39,269 39,771 0 97,393 12,244 109,637 149,4081982 1 0 0 1 0 0 25,943 28,677 0 168,807 21,221 190,028 218,7061983 1 0 0 2 0 0 24,288 26,080 1 81,431 10,237 91,668 117,7501984 3 0 0 5 0 0 17,137 18,800 2 91,813 11,542 103,355 122,1601985 6 0 0 9 0 0 24,295 27,226 4 89,457 11,246 100,703 127,9391986 10 0 0 16 0 0 53,725 57,522 6 287,078 36,090 323,168 380,7061987 16 8,770 0 26 8,770 0 29,839 32,356 10 181,772 22,851 204,623 245,7761988 24 17,541 0 38 17,541 0 37,633 41,766 14 161,864 20,349 182,213 241,5581989 40 26,311 0 64 26,311 0 41,049 46,830 24 106,352 13,370 119,722 192,9271990 74 35,082 0 118 35,082 0 50,639 52,671 44 241,231 30,326 271,557 359,4281991 113 43,852 0 180 43,852 0 13,840 18,782 66 92,551 11,635 104,186 166,9991992 190 52,623 0 302 52,623 0 22,247 28,296 112 137,106 17,236 154,342 235,5631993 349 61,393 0 554 61,393 0 21,210 30,402 205 126,692 15,927 142,619 234,9681994 680 70,164 0 1,080 70,164 0 22,833 34,757 400 108,176 13,599 121,775 227,7751995 78,934 0 78,934 0 0 80,610 0 34,643 54,089 0 215,025 27,032 242,057 376,7571996 21,040 0 21,040 0 0 21,486 0 23,162 44,909 0 425,538 53,496 479,034 545,4291997 19,796 379 19,115 301 605 19,521 308 16,711 36,914 223 370,649 46,596 417,245 474,5931998 3,242 956 2,042 244 1,527 2,086 249 31,824 59,417 562 146,460 18,412 164,872 228,1511999 14,742 557 13,213 971 890 13,494 992 38,937 66,107 327 241,472 30,357 271,829 353,3122000 18,350 779 17,535 36 1,244 17,907 37 57,740 112,435 458 121,846 15,318 137,164 268,7872001 16,923 419 16,451 53 669 16,800 54 60,094 136,315 246 234,102 29,430 263,532 417,3702002 8,817 550 8,038 229 879 8,209 234 51,747 127,028 323 271,715 34,159 305,874 442,2232003 9,423 3,756 5,558 109 5,999 5,676 111 41,172 84,304 2,207 192,434 24,192 216,626 312,7172004 6,775 1,096 5,620 59 1,750 5,740 61 40,475 101,614 644 403,209 50,689 453,898 563,0622005 8,989 2,109 6,657 224 3,368 6,798 229 22,790 79,922 1,239 99,659 12,529 112,188 202,5052006 9,485 1,286 7,950 250 1,971 8,119 255 22,149 67,852 673 231,768 12,529 244,297 322,4942007 23,517 416 23,046 55 638 23,535 56 49,366 116,101 218 244,879 12,529 257,408 397,7382008

14,675 363 14,274 37 557 14,577 38 21,163 62,986 190 192,102 12,529 204,631 282,7892009 17,863 3,903 13,930 30 5,984 14,226 30 22,196 74,683 2,043 222,916 12,529 235,445 330,3682010 3,036 90 2,929 17 138 2,991 18 16,156 65,029 47 219,965 12,529 232,494 300,6702011 12,709 897 11,660 152 1,375 11,907 155 60,314 103,638 469 211,661 12,529 224,190 341,266

Total recreational

removals

Year Commercial Recreational catches

Bottom longline discards

Shrimp bycatch (GOM)

Shrimp bycatch

(SA)

TotalTotal commercial removals

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Table 3. Percentage of Atlantic sharpnose shark commercial landings by region and year for all gear combined.

Year Gulf of Mexico Mid Atlantic South Atlantic

1993 0.0 5.8 94.21994 0.0 0.0 100.01995 3.7 0.0 96.31996 0.0 0.0 100.01997 0.2 0.0 99.81998 0.9 0.0 99.11999 0.9 0.2 98.92000 2.0 0.1 97.92001 0.1 0.0 99.92002 9.0 0.0 91.02003 24.7 0.0 75.32004 21.2 0.0 78.82005 22.2 0.0 77.82006 42.5 0.2 57.32007 11.2 16.2 72.62008 13.0 34.5 52.42009 6.2 0.0 93.82010 4.3 2.9 92.92011 16.2 1.3 82.4

Region

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Table 4. Percentage of bonnethead shark commercial landings by region and year for all gear combined.

Year Gulf of Mexico South Atlantic

1995 22.9 77.11996 24.1 75.91997 0.1 99.91998 1.1 98.91999 8.6 91.42000 0.1 99.92001 0.4 99.62002 0.0 100.02003 1.0 99.02004 4.4 95.62005 0.0 100.02006 3.9 96.12007 0.0 100.02008 0.0 100.02009 0.0 100.02010 0.0 100.02011 8.2 91.8

Region

13

Table 5. Percentage of Atlantic sharpnose shark commercial landings by region and gear for all years combined. (Years listed under each region indicate those usedin the summary calculation)

Gear Gulf of Mexico Mid Atlantic South Atlantic(1993 - 2011) (1993 - 2011) (1993 - 2011)

Drift nets 2.1 27.9 51.7Gillnets 31.3 51.5 14.3Lines 1.1 0.0 2.5Longlines 58.7 0.0 16.9Other 6.3 0.0 14.1Other nets 0.4 0.0 0.0Other trawl 0.0 0.0 0.0Otter trawl 0.0 0.0 0.3Pots & traps 0.0 0.0 0.0Purse seine 0.0 0.0 0.0Unknown 0.0 20.6 0.2

14

Table 6. Percentage of bonnethead shark commercial landings by region and gear for all years combined. (Years listed under each region indicate those usedin the summary calculation)

Gear Gulf of Mexico South Atlantic(1995 - 2011) (1993 - 2011)

Drift nets 4.8 75.6Gillnets 0.0 1.9Lines 40.2 1.3Longlines 37.5 9.2Other 8.3 11.9Other nets 8.4 0.0Other trawl 0.0 0.0Otter trawl 0.0 0.1Pots & traps 0.8 0.0Purse seine 0.0 0.0Unknown 0.0 0.0

15

0

200000

400000

600000

800000

1000000

1200000

Cat

ch (n

umbe

rs o

f sha

rks)

Year

Atlantic sharpnose shark (GOM+ATL)

Longline Nets Lines Total recreational removals shrimp bycatch

0

0

0

0

0

1

1

1

1

1

1

Cat

ch (n

umbe

rs o

f sha

rks)

Year

Atlantic sharpnose shark (GOM+ATL)


Figure 1. Total catches of Atlantic sharpnose sharks by sector. Top panel shows catches stacked; bottom panel shows them as proportions.

16

0

100000

200000

300000

400000

500000

600000

Cat

ch (n

umbe

rs o

f sha

rks)

Year

Bonnethead shark (GOM+ATL)


0

0

0

0

0

1

1

1

1

1

1

Cat

ch (n

umbe

rs o

f sha

rks)

Year

Bonnethead shark (GOM+ATL)


Figure 2. Total catches of bonnethead sharks by sector. Top panel shows catches stacked; bottom panel shows them as proportions.

17

0

20

40

60

80

100

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Land

ings

(%

)

Year

Atlantic Sharpnose Shark Landings by GearGulf of Mexico

Unknown

Purse seine

Pots & traps

Otter trawl

Other trawl

Other nets

Other

Longlines

Lines

Gillnets

Drift nets

0

20

40

60

80

100

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Land

ings

(%

)

Year

Atlantic Sharpnose Shark Landings by GearMid Atlantic Region

Unknown

Purse seine

Pots & traps

Otter trawl

Other trawl

Other nets

Other

Longlines

Lines

Gillnets

Drift nets

0

20

40

60

80

100

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Land

ings

(%

)

Year

Atlantic Sharpnose Shark Landings by GearSouth Atlantic Region

Purse seine

Pots & traps

Otter trawl

Other trawl

Other nets

Other

Longlines

Lines

Gillnets

Drift nets

Figure 3. Commercial landings of Atlantic sharpnose sharks by region and gear type. Data are from the ALS (SE + NE).

18

0

20

40

60

80

100

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Land

ings

(%

)

Year

Bonnethead Shark Landings by GearGulf of Mexico

Unknown

Purse seine

Pots & traps

Otter trawl

Other trawl

Other nets

Other

Longlines

Lines

Gillnets

Drift nets

0

20

40

60

80

100

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Land

ings

(%

)

Year

Bonnethead Shark Landings by GearSouth Atlantic Region

Purse seine

Pots & traps

Otter trawl

Other trawl

Other nets

Other

Longlines

Lines

Gillnets

Drift nets

Figure 4. Commercial landings of bonnethead sharks by region and gear type. Data are from the ALS (SE + NE).

19

0

50000

100000

150000

200000

250000

1995 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Land

ings

(lb

dw)

Year

Landings of Atlantic sharpnose sharks by state in the GOM (ALS SE+NE)

MS

FW

AL

0

10000

20000

30000

40000

50000

60000

70000

80000

90000

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Land

ings

(lb

dw)

Year

Landings of Atlantic sharpnose sharks by state (GOM) (PDC)

TX

LA

FW

AL

Figure 5. Commercial landings of Atlantic sharpnose sharks by state in the GOM from two data sources (PDC and ALS).

20

0

50000

100000

150000

200000

250000

300000

1991 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Land

ings

(lb

dw)

Year

Landings of Atlantic sharpnose sharks by state in the ATL (ALS SE+NE)

VA

SC

NJ

NC

MD

MA

FE

0

50000

100000

150000

200000

250000

300000

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Land

ings

(lb

dw)

Year

Landings of Atlantic sharpnose sharks by state (ATL) (PDC)

SC

NC

GA

FE

Figure 6. Commercial landings of Atlantic sharpnose sharks by state in the ATL from two data sources (PDC and ALS).

21

0

5000

10000

15000

20000

25000

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2006 2007 2008 2009 2010 2011

Land

ings

(lb

dw)

Year

Landings of bonnethead sharks by state (GOM) (PDC)

FW

AL

0

5000

10000

15000

20000

25000

30000

35000

40000

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2006 2009 2011

Land

ings

(lb

dw)

Year

Landings of bonnethead sharks by state in the GOM (ALS SE+NE)

FW

Figure 7. Commercial landings of bonnethead sharks by state in the GOM from two data sources (PDC and ALS).

22

0

50000

100000

150000

200000

250000

300000

350000

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Land

ings

(lb

dw)

Year

Landings of bonnethead sharks by state (ATL) (PDC)

SC

NC

GA

FE

0

20000

40000

60000

80000

100000

120000

140000

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Land

ings

(lb

dw)

Year

Landings of bonnethead sharks by state in the ATL (ALS SE+NE)

SC

NC

FE

Figure 8. Commercial landings of bonnethead sharks by state in the ATL from two data sources (PDC and ALS).

23

0102030405060708090

100

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

A+

B1

Cat

ches

(%

)

Year

Atlantic Sharpnose Shark Recreational Catches by Region

GOM MA SA

0

20000

40000

60000

80000

100000

120000

140000

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

A+B1

Cat

ches

Year

Catches of Atlantic sharpnose sharks by state from the MRFSS

VA

TX

SC

NY

NC

MS

MD

LA

GA

FLW

FLE

DE

AL

0

5000

10000

15000

20000

25000

30000

35000

A+B1

Cat

ches

Year

Catches of Atlantic sharpnose sharks by state from the Headboat survey

TX

SC

NC

MS

LA

GA

FLW

FLE

AL

Figure 9. Recreational catches (A+B1) of Atlantic sharpnose sharks by region from MRFSS, HBOAT and TXPWD survey data combined (top), by state from MRFSS (middle), and by state from the HBOAT survey (bottom).

24

0102030405060708090

10019

81

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

A+

B1

Cat

ches

(%

)

Year

Bonnethead Shark Recreational Catches by Region

GOM SA

0

10000

20000

30000

40000

50000

60000

70000

1981

1982

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

A+B1

Cat

ches

Year

Catches of bonnethead sharks by state from the MRFSS

TX

SC

NC

MS

LA

GA

FLW

FLE

AL

0

100

200

300

400

500

600

700

A+B1

Cat

ches

Year

Catches of bonnethead sharks by state from the Headboat survey

TX

SC

MS

LA

GA

FLW

FLE

Figure 10. Recreational catches (A+B1) of bonnethead sharks by region from MRFSS, HBOAT and TXPWD survey data combined (top), by state from MRFSS (middle), and by state from the HBOAT survey (bottom).

25

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

1993 1995 1997 1999 2001 2003 2005 2007 2009 2011

Ave

rage

wei

ght (

lbs.

dre

ssed

wt)

Year

16

109

2184

1222

1549

1791

2040

650

0

20

40

60

80

100

120

1993 1995 1997 1999 2001 2003 2005 2007 2009 2011

Ave

rage

len

gth

(FL

, cm

)

Year

1921

2213

443403

873

831

370

2201

819

Figure 11. Average weight (top) and length (bottom) of Atlantic sharpnose sharks observed in the Shark

Bottom Longline Observer Program. Error bars represent +/- one standard error;sample sizes are indicated in the top panel.

26

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

1993 1995 1997 1999 2001 2003 2005 2007 2009 2011

Ave

rage

wei

ght (

lbs.

dre

ssed

wt)

Year

1

12

33

1

4

3

3

0

20

40

60

80

100

120

1993 1995 1997 1999 2001 2003 2005 2007 2009 2011

Ave

rage

len

gth

(FL

, cm

)

Year

9

1 3

5

2

15

28

Figure 12. Average weight (top) and length (bottom) of bonnethead sharks observed in the Shark

Bottom Longline Observer Program. Error bars represent +/- one standard error;sample sizes are indicated in the top panel.

27

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Aver

age

wei

ght (

lb d

ress

ed w

t)

Year

104

0

10

20

30

40

50

60

70

80

90

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Aver

age

leng

th (

FL, c

m)

Year

178 196

507186

191

79

388

110

194

Figure 13. Average weight (top) and length (bottom) of Atlantic sharpnose sharks observed in the

Gillnet Observer Program. Error bars represent +/- one standard error;

sample sizes are indicated in the top panel.

28

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Aver

age

wei

ght (

lb d

ress

ed w

t)

Year

25

0

10

20

30

40

50

60

70

80

90

100

1992 1994 1996 1998 2000 2002 2004 2006 2008 2010

Aver

age

leng

th (

FL, c

m)

Year

2

2

94

31

14

4160 3

88

Figure 14. Average weight (top) and length (bottom) of bonnethead sharks observed in the

Gillnet Observer Program. Error bars represent +/- one standard error;

sample sizes are indicated in the top panel.

29

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Ave

rage

wei

ght (

lbs.

dre

ssed

wt)

Year

18

13

6

2

12

35

4259

25

19 168

63

92

44

62

47

31159 201

130189

0

10

20

30

40

50

60

70

80

90

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Ave

rage

len

gth

(FL

, cm

)

Year

272

167

140

160

178

125

139

112

65

88


Marine Recreational Fishery Statistics Survey. Error bars represent +/- one standard error;sample sizes are indicated in the top panel.

30

0

0.5

1

1.5

2

2.5

3

3.5

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Ave

rage

wei

ght (

lbs.

dre

ssed

wt)

Year

5

20

5

6

12

8

7

5

6

2542

4 16

12

21

16

27

26

58

42 43

0

10

20

30

40

50

60

70

80

90

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Ave

rage

len

gth

(FL

, cm

)

Year

38

42

26

20

28

15

30

189

11


Marine Recreational Fishery Statistics Survey. Error bars represent +/- one standard error;sample sizes are indicated in the top panel.

31

0

1

2

3

4

5

6

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2010

Ave

rage

wei

ght (

lbs

dres

sed

wt)

Year

244

75

80

85

90

95

100

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2010

Ave

rage

len

gth

(TL

, cm

)

Year

759

1036

580460

256

594

506 714

547

737

859

977

720

321

428

706

443

448

413

445

331

584

437

900

837


Headboat Survey. Error bars represent +/- one standard error;sample sizes are indicated in the top panel.

32

0

1

2

3

4

5

6

7

8

9

1019

86

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2010

Ave

rage

wei

ght (

lbs

dres

sed

wt)

Year

14

0

20

40

60

80

100

120

1986

1988

1990

1992

1994

1996

1998

2000

2002

2004

2006

2008

2010

Ave

rage

len

gth

(TL

, cm

)

Year

3

2

3

3

46

2

1

32

113

11

15

1

1

8


Headboat Survey. Error bars represent +/- one standard error;sample sizes are indicated in the top panel.

33

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Ave

rage

wei

ght (

lbs.

dre

ssed

wt)

Year

40

53

247149

168

257122

82

158

126

118

9669

94169

160

129

0

10

20

30

40

50

60

70

80

90

100

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Ave

rage

len

gth

(TL

, cm

)

Year

117

124

141

98 93

100

165

67

77

13762

96


Texas Parks and Wildlife Department Survey. Error bars represent +/- one standard error;sample sizes are indicated in the top panel.

34

0

1

2

3

4

5

6

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Ave

rage

wei

ght (

lbs.

dre

ssed

wt)

Year

29

3451

52

55

104

68

43

33

4259

2237

35

43

43

54

45

0

10

20

30

40

50

60

70

80

90

100

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Ave

rage

len

gth

(TL

, cm

)

Year

26

20

30 27

31

32

5036

62

32

39


Texas Parks and Wildlife Department Survey. Error bars represent +/- one standard error;sample sizes are indicated in the top panel.

35

1993

1998

2005

2010

0

200

400

600

800

1000

1200

1400

20-3

0

30-4

0

40-5

0

50-6

0

60-7

0

70-8

0

80-9

0

90-1

00

100-

110

110-

120

120-

130

130-

140

Year

N

Length bin (cm FL)

Length frequency of Atlantic sharpnose shark (BLLOP)1993

1994

1995

1996

1997

1998

1999

2000

2003

2004

2005

2006

2007

2008

2009

2010

2011

Figure 21. Length-frequency distribution of Atlantic sharpnose sharks from the BLLOP. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are fork lengths.

36

1994

1998

2005

2010

0

2

4

6

8

10

12

14

Year

N

Length bin (cm FL)

Length frequency of bonnethead shark (BLLOP)

1994

1995

1996

1997

1998

1999

2003

2004

2005

2007

2008

2009

2010

2011

Figure 22. Length-frequency distribution of bonnethead sharks from the BLLOP. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are fork lengths.

37

20002001

20022003

20042005

20062007

2008200920102011

0

50

100

150

200

250

Year

N

Length bin (cm FL)

Length-frequency of Atlantic sharpnose shark (GNOP)

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

Figure 23. Length-frequency distribution of Atlantic sharpnose sharks from the GNOP. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are fork lengths.

38

20002001

20022003

20042005

20062007

2008200920102011

0

5

10

15

20

25

30

Year

N

Length bin (cm FL)

Length-frequency distribution of bonnethead sharks (GNOP)

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

2010

2011

Figure 24. Length-frequency distribution of bonnethead sharks from the GNOP. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are fork lengths.

39

1981

1988

1995

2002

2009

0

20

40

60

80

100

120

140

160

30-4

0

40-5

0

50-6

0

60-7

0

70-8

0

80-9

0

90-1

00

100-

110

Year

N

Length bin (cm FL)

Length frequency of Atlantic sharpnose shark (MRFSS)1981 1982

1983 1984

1985 1986

1987 1988

1989 1990

1991 1992

1993 1994

1995 1996

1997 1998

1999 2000

2001 2002

2003 2004

2005 2006

2007 2008

2009 2010

2011

Figure 25. Length-frequency distribution of Atlantic sharpnose sharks from the MRFSS. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are fork lengths.

40

1981

1988

1995

2002

2009

0

2

4

6

8

10

12

14

16

18

20

Year

N

Length bin (cm FL)

Length frequency of bonnethead shark (MRFSS)

1981 1982

1983 1984

1985 1986

1987 1988

1989 1990

1991 1992

1993 1994

1995 1996

1997 1998

1999 2000

2001 2002

2003 2004

2005 2006

2007 2008

2009 2010

2011

Figure 26. Length-frequency distribution of bonnethead sharks from the MRFSS. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are fork lengths.

41

1984

1993

2001

2009

0

100

200

300

400

500

600

20-3

030

-40

40-5

050

-60

60-7

070

-80

80-9

090

-100

100-

110

110-

120

120-

130

130-

140

Year

N

Length bin (cm TL)

Length frequency of Atlantic sharpnose shark (HEADBOAT)

1984 1986

1987 1988

1989 1990

1991 1992

1993 1994

1995 1996

1997 1998

1999 2000

2001 2002

2003 2004

2005 2006

2007 2008

2009 2010

2011

Figure 27. Length-frequency distribution of Atlantic sharpnose sharks from the Headboat survey. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are total lengths.

42

1984

1993

2001

2009

0

1

2

3

4

5

6

7

8

9

10

40-5

0

60-7

0

70-8

0

80-9

0

90-1

00

100-

110

110-

120

Year

N

Length bin (cm TL)

Length frequency of bonnethead shark (HEADBOAT)

1984 1986

1987 1988

1989 1990

1991 1992

1993 1994

1995 1996

1997 1998

1999 2000

2001 2002

2003 2004

2005 2006

2007 2008

2009 2010

2011

Figure 28. Length-frequency distribution of bonnethead sharks from the Headboat survey. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are total lengths.

43

1983

1990

1997

2004

2011

0

20

40

60

80

100

120

30-4

040

-50

50-6

060

-70

70-8

080

-90

90-1

0010

0-11

011

0-12

012

0-13

013

0-14

0

Year

N

Length bin (cm TL)

Length frequency of Atlantic sharpnose shark (TXPWD)

1983 1984

1985 1986

1987 1988

1989 1990

1991 1992

1993 1994

1995 1996

1997 1998

1999 2000

2001 2002

2003 2004

2005 2006

2007 2008

2009 2010

2011

Figure 29. Length-frequency distribution of Atlantic sharpnose sharks from the TXPWD survey. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are total lengths.

44

1983

1988

1993

1998

2003

2008

0

5

10

15

20

25

30

35

40

45

50

20-3

0

30-4

0

40-5

0

50-6

0

60-7

0

70-8

0

80-9

0

90-1

00

100-

110

110-

120

120-

130

130-

140

Year

N

Length bin (cm TL)

Length frequency of bonnethead shark (TXPWD)

1983 1984

1985 1986

1987 1988

1989 1990

1991 1992

1993 1994

1995 1996

1997 1998

1999 2000

2001 2002

2003 2004

2005 2006

2007 2008

2009 2010

2011

Figure 30. Length-frequency distribution of bonnethead sharks from the TXPWD survey. The arrow indicates the approximate midpoint of length at maturity for sexes and areas combined. Note that lengths are total lengths.

Updated catches of sandbar, dusky, and blacknose...

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